Officer Down (2013)

Detective David Callahan has lived his life as a corrupt police officer. But when he's involved in a shady drug deal that goes wrong, and is shot in the process. Callahan barely survives the shooting, and given a second chance at life, decides to become a better person. But first, he must clean up the mess he's already made, by hunting down a criminal that he had worked with in the past that is responsible for a number of violent crimes. Callahan must find and kill him before the police can, or his shady past of years of corruption could come to light.